To my mind
Definition 1 of 1
Pro Tip 1/3Subjective Perspective
Shows your personal perspective, not a fact that everyone agrees on. 
To my mind, the book was more exciting than the movie.
Pro Tip 2/3Slightly Formal
Appropriate for writing and formal speeches, but might be less common in casual talk. 
To my mind, the council's decision should be reconsidered.
Pro Tip 3/3Conversation Starter
Use it to start a sentence when you want to introduce your viewpoint in a discussion. 
To my mind, we should focus more on renewable energy.